The boot won't open on my w203 2001 C220. Is there anyone who can help me assess what's going on? Yesterday I went to open the boot, using the handle on the boot in the usual way. The usual whirring sound happened (sounds like an electric motor) but the click that usually follows didn't happen and the boot stayed firmly shut. I think there's some sort of release mechanism from the handle down to the latch at the edge of the boot lid and I suspect that might have failed. So then I tried to open the boot with the key. This was very stiff - probably hadn't been turned for 10 years - but I managed to turn it 90 degrees anti-clockwise. At that point, there was a kind of click or resistance and it would move no further. However, it would also not move back to its original position. And the boot still didn't open. With the lock in the new position, the boot lock handle, the key fob and the driver's door switch no longer have any effect - ie there's now no whirring sound coming from the lock. I've tried lots of WD40 and jiggling of the lock with the key but the lock stays stuck in the new position. Feels as though the levers have engaged, leaving a bit of room to jiggle slightly back and forth but it won't turn back to the original position. I've tried both keys and both work fine on the driver's door but neither will turn the boot lock, though they both insert ok. I'm fairly certain the key matches the lock because it turned 90 degrees before getting stuck in the new position. What I'd like to know, if anyone can help, are some details of how the key is supposed to work (apart from opening the boot, of course!) 1. Does it turn off the circuitry to the remote boot unlocking? Is this why I no longer hear the whirring sound. 2. What are the lock's possible positions? On the driver's door the slit for the key is vertical. You can turn it 90 degrees from the vertical position anticlockwise to unlock the door (to 9 o'clock position) and 90 degrees clockwise from vertical to lock (to 3 o'clock position). But its normal position is vertical, though I can't remember whether it springs back to this position. Is this the same for the boot lock? 3. Do the symptoms suggest that the lock levers have got stuck and are stopping the key from turning back to the "vertical" position? I've looked for a diagram on the internet but without success. One contributor (was it Dec?) provided some very useful pictures of a w202 boot lock. But I haven't found anything specific to the W203. Hope someone can help.